"Official" 2014 USABO thread

<p>No. Phenyl is more nonpoar that tryptophan </p>

<p>I know that is my point. But it is less nonpolar than 3 other amino acids.</p>

<p><a href=“http://web.mit.edu/7.88j/www/restricted/Wolfenden-88.pdf”>http://web.mit.edu/7.88j/www/restricted/Wolfenden-88.pdf&lt;/a&gt; </p>

<p>on this page there is a detailed chart on page 4 from hydrophobic to phillic in order.</p>

<p>wait okay
I’m pretty sure it’s tryptophan
i was pretty sure the plant one was magnesium though?
what were your reasonings for putting sulfur?
sea sponge was probably gas exchange imo
the water zone i put plankton because i had no idea
and darn did i mess up this badly</p>

<p>i thought magnesium too.</p>

<p>magnesium fits the chlorophyll, but roots and delayed maturation?
Sulfur is an integral part of cysteine so absence of that would cause less well formed roots and probably maturation as well. And it plays a role in chlorophyll synthesis</p>

<p>I put tyrosine because you were looking for the amino acid that traveled the second least. I assumed the one that traveled the least was charged, so polar ones would travel the second least, hence tyrosine</p>

<p>I said in hibernation, the false one was that they monitor the CO2 levels in the atmosphere. That has no correlation to hibernation at all
And I really hope the sea sponge was gas exchange</p>

<p>lol i put conserve heat b/c body temp. is actually lowered during hibernation. was def overthinking it though, i was like “CO2 sounds so ridiculous they’re def putting it as a trap answer” </p>

<p>nah they still have to conserve the heat though</p>

<p>interesting interesting.</p>

<p>Any others you all remember?</p>

<p>The amino acid one; proline does not glow in UV.</p>

<p>so what did you guys put for amount absorbed in rainforest?
and what about the r and t states for hemoglobin. I forgot whether it was converted from r to t or t to r</p>

<p>what question was this?</p>

<p>r is relaxed/high affinity, t->r happens in the lungs </p>

<p>-I put tryptophan for the chromatography. IIRC the question asked for the second most hydrophobic within the 3 that absorb UV light (trp, tyr, phe), which suggests tryptophan (because of the amine).
-I put iron for the plant one lol. I’m pretty sure it wasn’t sulfur, but was unsure between magnesium and iron.
-I put angiosperms for the littoral zone (cattails, etc.)</p>

<p>This test = too hard lol. </p>

<p>Hey I put iron too.
The question said that there were four (4) UV spots and wanted the third (3rd).</p>

<p>hmm pretty sure it was asking for second most hydrophillic (polar), aka the one that traveled the second least. Why did you rule out sulfur?
so that hemoglobin question was true right?</p>

<p>but iron does not account for the reduced growth of the roots/shoot buds, nor does magnesium. the only deficiency that could explain it is sulfur </p>